The psych exam for pilots with adhd

I was a student pilot at a flight school in NJ in the fall of last year and the FAA sent me a letter saying I couldn't hold an airmen certificate afer I already logged around 15 hours of flight time before they grounded me. It seemed pretty illogical but anyway where I stand as of now is I need to get some psychological testing done (I was told it would be about $2K+) cause I was daignosed with adhd as a young kid and ive been off meds for over 2.5 years. As of right now I technically qualify as "allowed to fly" cause im not on any drugs and I passed a class 3 aviaton exam done by an AME about a year ago before the FAA requested that I had to send it back to them. I honestly don't understand under what circumstances they would ground me and request my medical back after I was already about half way through the training. The whole situation seems a bit biased and unfair, but If anyone can give me a little detail into what the psych exam entails for pilots who have had adhd that would be helpful so I can just get this testing done already, shut them up, and return to the skies again.

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